function foreach(){
	var strCookie=document.cookie;
	var arrCookie=strCookie.split("; ");
	for(var i=0;i<arrCookie.length;i++)
	{
		var arr=arrCookie[i].split("=");
		if(arr.length>0)
			DelCookie(arr[0]);
	}
}

function GetCookieVal(offset){
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
	endstr = document.cookie.length;
	return decodeURIComponent(document.cookie.substring(offset, endstr));
}

/**
 * 清除cookie
 * @param name
 */
function DelCookie(name){
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (name);
	document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}

/**
 * 获取cookie
 * @param name
 * @returns
 */
function GetCookie(name){
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen)
	{
	var j = i + alen;
	if (document.cookie.substring(i, j) == arg)
	return GetCookieVal (j);
	i = document.cookie.indexOf(" ", i) + 1;
	if (i == 0) break;
	}
	return null;
}

/**
 * 清除cookie
 */
function clearCookie(){
    var date = new Date();
    date.setTime(date.getTime()-10000);
    var keys=document.cookie.match(/[^ =;]+(?=\=)/g);
    if (keys) {
        for (var i =  keys.length; i--;)
          document.cookie=keys[i]+"=0; expire="+date.toGMTString()+"; path=/";
    }
}

//clearCookie();
